So, I take it you disagree with the fair number of scientists who propose precisely a warming trend resulting in the shutdown of the thermohaline circulation in the North Atlantic (and secondarily Northern Pacific) as the trigger for an ice age.
Care to share your evidence against the hypothesis, rather than merely asserting it is wrong?
No, I don't disagree with the process. A shutdown of the North Atlantic thermohaline circulation would very likely result in a significant cooling of the Northern Hemisphere, especially in Europe and eastern North America. But this temporary cooling, even though it could last centuries, is insuffient to trigger a new period of continental glaciation. If you research the discussions of this possibility (and that's all it is right now), you'll see that nobody in the scientific community is suggesting this would trigger continental glaciations.